Crude oil is a mixture of hydrocarbons.
.1
Define the term hydrocarbon.
[1 mark].2
Butane has 4 carbon atoms. Write the formula of butane.
[1 mark].3
Which fraction is used as fuel for aircraft?
[1 mark]AQA GCSE Chemistry June 2025 Paper 2F
5 questions on this paper's topics
17:001 of 5
Pure aluminium is soft. Aircraft bodies are made from aluminium alloys.
.1
Explain why pure aluminium is soft.
[2 marks].2
Explain why aluminium alloys are harder than pure aluminium.
[2 marks]A student tests two samples of a white solid. The pure solid melts at 122 °C.
Sample A melts at 122 °C. Sample B melts between 115 °C and 119 °C.
.1
Which sample is impure?
[1 mark].2
Give the meaning of a pure substance in chemistry.
[1 mark].3
Which of these is a formulation?
[1 mark]Blue hydrated copper sulfate is heated. It turns into white anhydrous copper sulfate and water.
.1
Give the colour change when water is added to white anhydrous copper sulfate.
[1 mark].2
The forward reaction (heating) is endothermic. What is the reverse reaction?
[1 mark].3
What does the symbol ⇌ mean?
[1 mark]A student dissolves 5.0 g of copper sulfate in water to make 250 cm³ of solution.
.1
Give the volume of the solution in dm³.
[1 mark].2
Calculate the concentration of the solution in g/dm³.
[2 marks]